In Deveci 2025 et al., on 3D drill guides, what best describes the study’s primary conclusion?
A. Screw deviation was unacceptable
B. Guides increased risk of canal breach
C. Technique requires excessive operative time
D. Guides allowed accurate and safe screw placement
E. Method was inferior to freehand technique
Answer: Guides allowed accurate and safe screw placement
Explanation: The study concluded PSG-assisted technique was fast, accurate, and safe in a cadaveric model.
In Deveci 2025 et al., on 3D drill guides, what was the median time for screw guide placement and drilling?
A. 4.1 minutes
B. 5.5 minutes
C. 6.3 minutes
D. 7.2 minutes
E. 9.8 minutes
Answer: 7.2 minutes
Explanation: The full guide-assisted screw placement process took a median of 7.2 minutes.
In Deveci 2025 et al., on 3D drill guides, how many screws breached the sacral canal contents?
A. 0
B. 1
C. 2
D. 10
E. All 20
Answer: 0
Explanation: None of the 20 screws breached the canal contents, despite 19 breaching the canal wall (≤ grade 2).
In Deveci 2025 et al., on 3D drill guides, what was the median screw trajectory deviation in the transverse plane?
A. 0.45 degrees
B. 0.72 degrees
C. 0.88 degrees
D. 1.2 degrees
E. 2.0 degrees
Answer: 0.88 degrees
Explanation: The median angular deviation from plan was 0.88° transverse and 0.72° dorsal.
In Deveci 2025 et al., on 3D drill guides, what was the median grade of sacral canal wall cortical breach?
A. 0
B. 1
C. 2
D. 3
E. 4
Answer: 0
Explanation: All screws had cortical breaches ≤ grade 2, but the median breach grade was 0 (IQR 0–1).